Haila and Nick

These two characters run the eateries in the archipelago. Nick runs
the Diner on Verdure Island, and Haila manages the Cafe on Sprout Island.
Neither one of the owners will ever leave their businesses, so there
isn't much you can do with them interaction-wise.

Nick and Haila are important when it comes to getting cooking recipes.
If you give them cooking ingredients, in exchange they will give
you recipes for your kitchen. They can each give you one recipe per
day, and you can get multiple individual recipes from the same
cooking ingredient.

For example, you can give an Egg to Nick to
get the recipe for Egg Over Rice, then give another Egg to Haila
for the Boiled Egg recipe. The next day, give Nick another Egg for
Mayonnaise, and Haila an Egg for Spa-Boiled Egg. When they are
out of recipes to give you for a specific ingredient, they will
let you know ("I can't think of anything to make with this
ingredient").

To get their Sun Stones, you need to learn a lot of recipes from
them. For Nick, you will need to learn 40 cooking recipes, and Haila
requires 30 cooking recipes. You don't have to actually make these
dishes in your kitchen; just learn the recipes from them. When
you learn your 40th (for Nick) and 30th (from Haila), you will
be given the Sun Stone.